Bike to your room at a hotel bolted to the side of a mountain. Survey the view from a luxurious flying cruise ship. Take a dip in the pool atop a repurposed oil rig. We've seen the future, and it's all about adaptation, renewable energy, and minimal footprints. But to judge from recent architectural proposals, it's also about a definitive shift away from it all, up into the clouds or onto man-made islands; Auric Goldfinger would feel right at home at several of our featured properties. Here, we present a primer on where your grandchildren might spend their vacations: Spotlighted are six projects that range from architecture students' dorky dreams to complexes actually under construction.